enumerable_filter.jl at 192a00e ⋅ queryverse/QueryOperators.jl

# T is the type of the elements produced by this iterator
struct EnumerableFilter{T,S,Q<:Function} <: Enumerable
    source::S
    filter::Q
end

Base.eltype(iter::Type{EnumerableFilter{T,S,Q}}) where {T,S,Q} = T

function filter(source::Enumerable, filter_func::Function, filter_expr::Expr)
    T = eltype(source)
    S = typeof(source)
    Q = typeof(filter_func)
    return EnumerableFilter{T,S,Q}(source, filter_func)
end

function Base.iterate(iter::EnumerableFilter{T,S,Q}, state...) where {T,S,Q}
    ret = iterate(iter.source, state...)

    while ret!==nothing
        if iter.filter(ret[1])
            return ret
        end

        ret = iterate(iter.source, ret[2])
    end

    return nothing
end

1		# T is the type of the elements produced by this iterator
2		struct EnumerableFilter{T,S,Q<:Function} <: Enumerable
3	23	source::S
4		filter::Q
5		end
6
7	0	Base.eltype(iter::Type{EnumerableFilter{T,S,Q}}) where {T,S,Q} = T
8
9		function filter(source::Enumerable, filter_func::Function, filter_expr::Expr)
10	23	T = eltype(source)
11		S = typeof(source)
12	23	Q = typeof(filter_func)
13	23	return EnumerableFilter{T,S,Q}(source, filter_func)
14		end
15
16		function Base.iterate(iter::EnumerableFilter{T,S,Q}, state...) where {T,S,Q}
17	23	ret = iterate(iter.source, state...)
18
19	23	while ret!==nothing
20	23	if iter.filter(ret[1])
21	23	return ret
22		end
23
24	23	ret = iterate(iter.source, ret[2])
25		end
26
27	23	return nothing
28		end

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